Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 340,074	$ 174,560	$ 304,442
Other comprehensive (loss) income:
Foreign currency translation (loss) gain	(4,789)	(1,193)	691
Defined benefit pension plan:
Prior service cost arising during period, net of tax	(2,415)
Actuarial gain (loss) arising during period, net of tax	2,999	2,075	(5,352)
Less: amortization of actuarial gain and prior service cost included in net periodic pension cost, net of tax	904	1,020	522
Defined benefit pension plan, net	1,488	3,095	(4,830)
Unrealized (loss) gain on available-for-sale securities, net of tax	(250)	(128)	67
Other comprehensive (loss) gain, net of tax	(3,551)	1,774	(4,072)
Comprehensive income	$ 336,523us-gaap_ComprehensiveIncomeNetOfTax	$ 176,334us-gaap_ComprehensiveIncomeNetOfTax	$ 300,370us-gaap_ComprehensiveIncomeNetOfTax

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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Net of tax amount of the income statement impact of the reclassification adjustment for the actuarial gain (loss) and prior service costs recognized as a component of net period benefit cost.

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